Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74d88449c59136f…

MALICIOUS

PDF

39.4 KB Created: 2020-08-22 14:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e299436fb24f31ee836eaf43b394fa82 SHA-1: 50279fc84f1d555a3555a18631f6affc916752a6 SHA-256: a74d88449c59136fc6438c5fbe19cd3df00172e508faa65219404800537929fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded links, including one pointing to a known malicious redirector at 'https://ttraff.cc/pify?keyword=fortnite+season+5+week+6+challenges+guide'. The document body, though heavily obfuscated, appears to contain text related to a 'Fortnite season 5 week 6 challenges guide', suggesting a lure to attract users to click on the malicious link. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=fortnite+season+5+week+6+challenges+guide
    • http://files.omas-siskonakw.org/uploads/1/3/0/8/130813141/9183428.pdf
    • http://files.exuviateesthetics.com/uploads/1/3/2/6/132695568/mesibomuluvujavil.pdf
    • http://files.starryeyesmicroblading.com/uploads/1/3/0/7/130776500/lafilirokuridejamibi.pdf
    • https://cdn.shopify.com/s/files/1/0435/8907/5099/files/39798039191.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4119/files/absolutismo_europeo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/88685804296.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/bafozetifetabovuma.pdf
    • https://cdn.shopify.com/s/files/1/0432/0133/1360/files/alif_novel_episode_5_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/6512/0670/files/adding_integers_coloring_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/2151/6449/files/wewuvuxutanib.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9520/files/35508379295.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/age_of_mythology_mods.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/schma_de_l_appareil_digestif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a42.bin
97804dd8397c47ec24e49fdd9aca654469add8b9cfd041c6b1894a9242550e2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A42 5592 bytes
font_01_sfnt_off00006d58.bin
544ece9b99b6706b845c18887525a20de2c63e78cc9c47e7c47c129ed8c3ef2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D58 10396 bytes